Alex White has been in the clubhouse. He’s been wearing a uniform and has a locker. But now it’s official. The Rockies placed White on the 25-man roster for his start tonight, with reliever Edgmer Escalona going on the disabled list with a right rotator cuff strain.

White has strung together 15 1/3 scoreless innings at Double-A, including 7 2/3 scoreless in a victory last Thursday over the Midland Rockhounds. Escalona has been unavailable in recent days because of arm soreness. Jason Hammel will take over Escalona’s longman role in the bullpen. There will be more changes in the coming days.

Closer Huston Street (right triceps) and Matt Lindstrom (ulnar nerve upper arm) both pitched in Triple-A Monday. Street performed well, while Lindstrom struggled. Both will pitch again Wednesday and could be activated for the weekend series in Los Angeles.

As for other news, the Rockies acquired Evergreen High’s Kevin Kouzmanoff[1] from Oakland for cash considerations or a player to be named later. The Rockies attempted to acquire Kouzmanoff last winter, but Oakland decided to tender the third baseman a contract. He has struggled mightily, hitting .221 with four home runs and 17 RBIs. He owns 82 career home runs, and knows NL West pitching after playing several years with the Padres. He’s making $4.75 million this season.

The Rockies will pay only a fraction of that, if any. This gives them an opportunity to get a look at Kouzmanoff in Triple-A to see if he’s an option going forward next season. They are already conducting a similar experiment with Jorge Cantu in Triple-A. Third base is uncertain given Ian Stewart’s disappointing year. Stewart is hoping to resume playing in Triple-A this week after receiving a cortisone shot in his wrist. Ty Wigginton and Chris Nelson have shared time there in recent weeks.